Valve-grinder



N. l. PETERSGN.

VALVE GRINDER.

APPLICATION vFILED JAN. 30, 1920. v 1,393,567.' Patented 001;. 11, 1921.

UNITED STATES PATENT OFFICE. y

i NIELS JULIUs PN'JJEItsoN,` or MINNEAPOLIS, MINNESOTA.

vv27o-ZZ whom z'zfmag/ concern:

Be it known that I, NIELs J. Pn'rnnsoN, a

citizen. ofthe United States, lresident of Minneapolis, rcounty of-Hennepin, State of Minnesota,rhave invented certainnew and useful Improvements in Valve-Grinders, of whichthe following is a. specification.

The object of my invention is to provide a device by means of. which the valves of an Vinternal combustion engine can be easily and quickly ground and iitted to theirseats.

A further object is to provide a device of the class described, particularly adapted for grinding valves of a Ford engine.

Gther objects of the invention will appear from the following detailed description.l l y In the accompanying drawings forming part of this specification,

Figure l is a plan view of a portion of a Ford engine cylinder, and valves, with my invention applied thereto,

Fig. 2 is a sectional view on the line 2 2 of Fig. 1,

Fig. 3 is a sectional view on the line 3-3 of Fig. 2, f

Fig. 4 is a sectional view on the' line 4&4: of Fig. 2. f

In the drawing, 2 represents the wall of the cylinder and particularly a cylinder of the Ford engine type. This wall is provided with a series of holes 3 tapped therein by means of which the head of the cylinder (not shown) may be bolted securely in place. 4 represents a stud that is threaded to iit into one of the holes in the cylinder wall that is located in engines of this type at a point midway between the valve seats 5 of the valve 6 which have stems 7 extending down through the wall of the engine and normally held in their open position pre- -paratory to grinding by suitable springs 8. These valves are of the usual type, having beveled edges to ft the correspondingly shaped surfaces of the seats and sockets 9 are formed in the upper surfacesV of the valves to receive forks 10 mounted on studs 11. A bracket 12 has a socket 13 therein to receive the upper end of the pin 4: and on which pin the bracket is free to slide vertically. The upper portions of the studs 11 have bearings 14; in the brackets 12 and wheels 15 pressed preferably from sheet metal have hubs 16 secured to the upper ends of' the studs 11 and bear on the upper surfaces of the bracket 12. The wheels 15 are of. sucient size indicated in Fig.

vtion of the bar, the gears vALvn-enINnnR.

Y Specication ofIetters Patent.v Patentgd 0G15, 11, 1921 Y Application lve. January 30, 1920. VSerial No. 355,255..l

p to substantially bridge the space between the valves and allow the insertion of a. serpentine bar 17 which is in the form of a rack, preferably pressed from sheet metal and joined at its ends to an operating -rod 18 by means of which the bar Amay be reciprocated back and forth to revolve thewheels 15 and impart a corresponding movement to the valves. Springs 19 are mounted on the studsll and normally tend Vto hold the bracket ina raised position, as 2, with a space kbetween the bottom ofits socket andthe upper end of the pin 4, thereby allowing downward movement of the value operating mechanism against the tension of the springs 19.

In operation, the user of the device will grasp the ends of the rod 18 and move the rack back and forth between the wheels 15 with a slight downward pressure sutiicient to seat the valve and hold the forks 10 in operative engagement with the valves. The usual emery dust or other vgrinding maten rial is inserted between the valves and their seats and the reciprocating movement of the rack bar will rotate the valves simultaneously and grind them down to a smooth finished surface in substantially the same manner as valves of this type are usually ground.

The advantage of this device lies in the fact that it is only necessary to remove the head vplate of the engine, insert the pin 4 in the proper bolt hole therein, mount the bracket 12 on the supporting stud and then reciprocate the rack bar 17 to revolve the wheels and impart a corresponding movement to the valves and grind them down to their seats.

In dotted lines in Fig. 2 I have indicated how the device is pressed down to seat the valves in their working position before the grinding operation is begun.

The springs 8 shown herein are provided for normally tending to push the valves open during the grinding operation.

I claim as my invention:

1. A valve grinder including a support adapted toy be secured to an engine block adjacent two opposed valves, studs rotatably borne in said support and adapted each to engage one of said valves, a gear affixed to each stud in adjacent spaced relation, and a rack bar presenting teeth on opposed sides adapted to be inserted between said spaced gears whereby, upon reciprocaare simultane- Y ously rotated and the valves thereby ground to their respective seats.

k2. A valveV grinder adapted simultane-V lspaced pairs of" gears whereby, upon reciprocation of the bar, the gears may be s imultaneously rotated and the valves ground to their respective seats. 1

- 3.' A, valve grinder vadapted simultaneously lto grind two valves including studs adapted each to engage one of said valves,

supporting meanswhereby said studs may be rotatably mounted, aV gear 'affixed to each stud in Vadjacent-'spaced relation,`and a serpentine bar adapted to be inserted between said spaced gears whereby, upon reciprocateeth on opposed.

f being Vadapted to beinserted between said y tion of the bar, the gearsmay be simultaneously rotated and the valves thereby ground to their respective seats.

4. A valve grinder adapted simultaneously to grind two valves, including studs adapted each to engage one ofvsaid-valves, supporting means whereby' said studs'may be rotatably mounted, a gear affixed to each stud in adjacent spaced relation, and an elongated endless rack bar having substanytially parallel arms, gearteeth on opposed sides of one of the arms, said toothed arm spaced gears, the other arm being shaped to" provide an operating handlewhereby, upon reciprocation of the rack bar the gearsmay bev simultaneously rotated and the valves thereby ground to their respective seats.

hand this22d day of January, 1920. Y

NiEVLs .TULru'sl PETERSON.

In witness whereof I have hereunto set my 

